Method and apparatus for optical detection of mixed venous and arterial blood pulsation in tissue
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United States of America Patent
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Dec 17, 2013
Grant Date -
Sep 8, 2005
app pub date -
Mar 8, 2004
filing date -
Mar 8, 2004
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Abstract
A method and device for detecting the presence of mixed venous and arterial blood pulsation in tissue, including receiving first and second electromagnetic radiation signals from a blood perfused tissue portion corresponding to infrared and red wavelengths of light, obtaining a measure of a phase difference between the first and second electromagnetic radiation signals, comparing the measure with a threshold value to form a comparison, and detecting the presence or absence of venous pulsation using the comparison.
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